Stuffing-box.



E. KOERTING, JR. da O. THRAENHART.

STUFFING BOX.

APPLICATION FILED FEBS, 1912.

Patented Mar. 18, 1913.

UNITED sTATEs PATENT oEEioE..

ERNST KOERTING, JR., AND OSKAR 'II-IRAENHART, OF LINDEN, NEAR HANOVER, GER- MANY, ASSIGNORS T0` GEBR. KOERTING AKTIENGESELLSCHAFT, 0F KRTINGS- DORF, NEAR HANOVER, GERMANY.

STUFFING-BOX.

Specification of Letters Patent.

Patented Mar. 18, 1913.

Application led February 6, 1912. Serial No. 675,880.

To all lwhom t may concern.'

Be it known that we, ERNST KoEk'riNG, Jr.. a subject ot' the King of Prussia, and resident of 7l Badenstedterstrasse, Linden, near Hanover, Germany, and OSKAR THRAEN HART, a subject of the King of Prussia, and resident of 8 Schwalenbergerstrasse, Linden, near Hanover, Germany, have jointly invented a new and useful Improved Stuffing- Box, of which the following is a specification. v

This invention relate-s to an improvemen in stutling boxes for the piston rods ot' internal combustion engines and has for its object to prevent the destruction of the packing 'rings by tongues of flame entering between thepiston rod and the bush of the st-utling box during the explosion or combustion owing t-o the pressure in the engine cylinder. v

The invention also has for its object to prevent burnt fuel, dust and the like being forced into the stutling box by the pressure existing in the cylinder which easily occasions leakage of the stutng box.

According to the present. invention a compressed incombustible cooling gas such as air, is supplied to a space between the packing material and the piston rod from which it may flow into the engine cylinder. By this means the packing material of the stuffing box is kept cool and the products of combustion prevented lfrom entering the stuffing box.

In order that the invention may be more clearly understood, reference is made to the accompanying drawings which show by way ot example two methods of carrying out the invention.

Figure l is a sectional View through one form of the stufling box. and Fig. 2 a similar view ofy a slightly modified form ot same.

On the drawings a indicates the piston rod of a piston b working within the cylinder, c of an internal combustion engine, the piston rod a working through a stuffing box casing d which is provided with a bush e,

packing rings f and a gland g in the usual manner. In Fig. 1 of the drawings the bush e is provided with an interior annular groove c connected by means of an aperture e2 to a bore h to which a compressed incombustible cooling gas such as air is supplied t'rom a supply pipe z' through a regulating valve 7a, the bush e being of somewhat larger diameter than the piston rod a. so as to provide an annular space l through which the compressed air entering the groove c may escape into the cylinder fr. In order to obtain etticient'cooling of the stuffing box itis desirable that the compressed air be supplied at a greater pressure than t-he maximum pressure existing in the cylinder and at a considerably lower temperature although it will of course be understood that the compressed air may be supplied at a lower pressure and slightly heated. The regulating valve (l may be so arranged as to cut. off the supply of compressed air when litt-le. or no pressure exists in the interior ot the. cylinder c and the supply ot compressed air thereby economized.

In the modification shown in Fig. 2 the packing rings f are provided wit-h an annular groove f communicating with the bore o, to which a compressed incombustible cooling gas is supplied from a pipe m through a regulating valve n. By this means the supply of compressed air may be economized While at the same time obtaining an eiiicient cooling of the packing material.

In the appended claims it is to he understood that the term packing material includes both the packingv rings and the bush or head of the stufling box.

We claim 1. A stuiling box for the piston rods of internal combustion engines, comprising packing material around the piston rod and means for supplying a compressed incombustible cooling gas to the space between said packing material and piston rod to prevent the entry of llames and foreign matter into said space.

2. A stuffing box for the piston rods oi internal combustion engines, comprising packing material around the piston rod, an internal annular groove in the inner peripheral surface of said packing material, and means for supplying a compressed incombustible cooling gas to said groove to prevent the entry of flames and foreign mat.- ter into the space bet-Ween said packing material and piston rod.

3. A stulling box for the piston rods of internal combustion engines, comprising packing inoierial :irounfl the piston rod, means for supplying :i compressed incornbnstiiole cooling gas lo the space between snifl packing material and pison rod tonie vent the .enr-ry of flames and foreign maiter inte snirl space, and valve means for regulating the supply of said compressed gas according ro lhe pressure exisling in the engine cylinder.

4. A stuffing box for ille piston rools or infernal combustion engines, comprising a bush and packing rings arnnnrl ine piston rofl, a groove in the inner peripheral surface of said bush sind means for supplying n compressed ineomloustible cooling gos o said groore.

5. A. shining box for die pisron rods or inlernal Combustion engines, comprising n nnnoynnn bush and packing rings around the piston rofl, said bush being of somewhat larger diameter than the piston rod so as to provide an annular space between said bush and piston rofl open to the engine cylinder, a groove in *the inner peripheral surface of said bush and means for supplying cornpressed air fo said groove for cooling said bush and for scavenging foreign marier nur. of said annular space.

ln Witness whereof We have llereunlo set our hands in ille presence of two Wiinesses.

ERNST KUERJNG, JUN. @SKAR THRARNHART.

lVi-nesses JOHANNES .lnnnmmn FRANZ rlmens. 

